Prefix is butane, therefore this alkanenitrile has 4 carbon atoms in the chain. Step 3: Draw a chain of carbon atoms of the required length using dashes to represent a single covalent bond between each pair of carbon atoms. Dec 15, 2013 · Draw the electron dot structures for (a) ethanoic acid. (b) H2S. (c) propanone. (d) F2. | Unit 4 Chemistry NCERT solution Class 10 admin December 15, 2013